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            List.remove()无效!!! | 
        
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        <blockquote>
<p>“还是接触Java太少了，以前根本没碰到过，记录下这个小问题”</p>
</blockquote>
<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>今天做到购物车功能 写JS写到想吐 还是感觉Java简单点 前端对于我来说还是个弱点 我就用笨办法实现 用JQuery一个一个选择 终于完成了基本的功能</p>
<p>在做购物车商品加减时 网页用JS加减同时向服务器发送AJax加减数量 由于使用的分布式架构 购物车商品不能存在Session中 就选择存储在Redis中 每次都去数据遍历 购物车东西少还可以 一旦商品多了 感觉太浪费性能了</p>
<p>然后就想着有没有办法可以不用每次遍历整个购物车List集合 然后就想到从页面传入一个索引值 直接定位List中需要加减的商品 于是就引发了这个问题</p>
<p><a href="#build">不想看我BB的 直接跳到最后看总结 </a></p>
<hr>
<h2 id="正文"><a href="#正文" class="headerlink" title="正文"></a>正文</h2><center><img src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-cart.png"></center><br><center>购物车截图</center>

<p>服务端代码：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> *</div><div class="line"> * 根据商品id和数量对购物车增加商品或减少商品</div><div class="line"> *</div><div class="line"> * <span class="doctag">@param</span> pid       商品id</div><div class="line"> * <span class="doctag">@param</span> pcount    增加数量</div><div class="line"> * <span class="doctag">@param</span> type      1 增加 2 减少</div><div class="line"> * <span class="doctag">@param</span> index     商品位置   ps:用于直接定位商品 不用遍历整个购物车</div><div class="line"> * <span class="doctag">@return</span></div><div class="line"> */</div><div class="line"><span class="meta">@Override</span></div><div class="line"><span class="function"><span class="keyword">public</span> XbinResult <span class="title">decreOrIncre</span><span class="params">(Long pid, Integer pcount, Integer type, Integer index, String cookieUUID)</span> </span>&#123;</div><div class="line"></div><div class="line">    String key = CART_INFO_PROFIX + cookieUUID;</div><div class="line"></div><div class="line">    List&lt;CartInfo&gt; cartInfoList = getCartInfoListByCookiesId(cookieUUID);</div><div class="line">    <span class="keyword">if</span> (cartInfoList == <span class="keyword">null</span> || cartInfoList.size() == <span class="number">0</span>) &#123;</div><div class="line">        <span class="keyword">return</span> XbinResult.build(<span class="number">400</span>, <span class="string">"购物车没有商品 请不要非法操作!"</span>);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    CartInfo cartInfo = cartInfoList.get(index);</div><div class="line"></div><div class="line">    <span class="keyword">if</span> (type == <span class="number">1</span>) &#123;</div><div class="line">        cartInfo.setNum(cartInfo.getNum() + pcount);</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        cartInfo.setNum(cartInfo.getNum() - pcount);</div><div class="line">    &#125;</div><div class="line">    cartInfoList.remove(index);</div><div class="line">    cartInfoList.add(index, cartInfo);</div><div class="line">    jedisClient.set(key, FastJsonConvert.convertObjectToJSON(cartInfoList));</div><div class="line">    jedisClient.expire(key,REDIS_CART_EXPIRE_TIME);</div><div class="line"></div><div class="line">    <span class="keyword">return</span> XbinResult.ok();</div><div class="line">&#125;</div></pre></td></tr></table></figure></p>
<blockquote>
<p>代码就不解释了 太简单了。</p>
</blockquote>
<p>点击➕一件商品 然后就出现了一个非常奇怪的现象 商品确实加1了 但是出现了2个相同的商品</p>
<center><img src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-Bug.png"></center><br><center>点击➕号后刷新出现</center>

<p>查询Redis中数据是这样的</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div></pre></td><td class="code"><pre><div class="line">[</div><div class="line">  &#123;</div><div class="line">    <span class="attr">"colour"</span>: <span class="string">"黑色"</span>,</div><div class="line">    <span class="attr">"id"</span>: <span class="number">148630831972863</span>,</div><div class="line">    <span class="attr">"imageUrl"</span>: <span class="string">"http://192.168.125.132/group1/M00/00/00/wKh9hFiM0l-AQuvEAABmx7u5QSA128.jpg"</span>,</div><div class="line">    <span class="attr">"name"</span>: <span class="string">"Apple MacBook Pro 15.4英寸笔记本电脑 深空灰色（Multi-Touch Bar/Core i7/16GB/512GB MLH42CH/A）"</span>,</div><div class="line">    <span class="attr">"num"</span>: <span class="number">3</span>,</div><div class="line">    <span class="attr">"price"</span>: <span class="number">2148800</span>,</div><div class="line">    <span class="attr">"size"</span>: <span class="string">"32GB"</span>,</div><div class="line">    <span class="attr">"sum"</span>: <span class="number">6446400</span></div><div class="line">  &#125;,</div><div class="line">  &#123;</div><div class="line">    <span class="attr">"$ref"</span>: <span class="string">"$[0]"</span></div><div class="line">  &#125;,</div><div class="line">  &#123;</div><div class="line">    <span class="attr">"colour"</span>: <span class="string">"黑色"</span>,</div><div class="line">    <span class="attr">"id"</span>: <span class="number">148630639229938</span>,</div><div class="line">    <span class="attr">"imageUrl"</span>: <span class="string">"http://192.168.125.132/group1/M00/00/00/wKh9hFiMy4eAV5lwAAB25IS6WjM274.jpg"</span>,</div><div class="line">    <span class="attr">"name"</span>: <span class="string">"Apple iPhone 7 (A1660) 32G 黑色 移动联通电信4G手机"</span>,</div><div class="line">    <span class="attr">"num"</span>: <span class="number">2</span>,</div><div class="line">    <span class="attr">"price"</span>: <span class="number">519900</span>,</div><div class="line">    <span class="attr">"size"</span>: <span class="string">"32GB"</span>,</div><div class="line">    <span class="attr">"sum"</span>: <span class="number">1039800</span></div><div class="line">  &#125;</div><div class="line">]</div></pre></td></tr></table></figure>
<blockquote>
<p>“$ref”: “$[0]” 表示数据引用索引0位置的数据</p>
</blockquote>
<p>List.remove()无效 无效第一时间想到的是查查看API是不是我用错了</p>
<center><img src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-api.png"></center>

<p>API并没有用错 但为什么就是remove不掉呢！ 然后就DEBUG查看了下整个流程</p>
<center><img src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-DEBUG1.png"></center>

<p>发现问题了 <strong>内存地址竟然一样一样！！！</strong></p>
<center><img src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-DEBUG2.png"></center>



<p>这才想起来 我把CartInfo类给序列化了 <strong>脑中万**马奔腾</strong> 不是我没事去实现Serializable接口 而是Dubbox传输的对象 不实现Serializable就报错</p>
<p>但是也说不通啊 为什么我Remove不掉呢 我只想保留一个</p>
<p>在次查询API 发现问题了 remove()有重载方法</p>
<center><img class="shadow" src="http://on2bs9q7q.bkt.clouddn.com/List.remove()-Bug2.png"></center>

<p>……</p>
<p>我定义的Integer index ，他竟然没有自动拆箱 当成对象去比较了 这两个对象当然不会相同 返回false 自然不会删除 </p>
<p>应该是默认调用的boolean remove(Object o) 方法才没有拆箱</p>
<h2 id=""><a href="#" class="headerlink" title=""></a><p id="build"></p></h2><h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>List Remove对象时不要传Integer对象的index值 要传也只能是传index.intValue()；</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//cartInfoList.remove(index);</span></div><div class="line"><span class="comment">//cartInfoList.add(index, cartInfo);</span></div></pre></td></tr></table></figure>
<p>最后我直接把这两句全注释了 解决了问题。</p>
<h2 id="著作权声明"><a href="#著作权声明" class="headerlink" title="著作权声明"></a>著作权声明</h2><p>本文首次发布于 <a href="http://binux.cn">Binux Blog</a>，转载请保留以上链接</p>

    

    
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